The American space agency Nasa is rolling out its giant new Moon rocket to prepare it for a maiden flight, BBC reported.
Known as the Space Launch System (SLS), the vehicle is being taken to Pad 39B at the Kennedy Space Center in Florida for a lift-off scheduled for 29 August.
The debut outing is a test with no crew aboard, but future missions will send astronauts back to the lunar surface for the first time in over 50 years.
The near 100m-tall (328ft) SLS is riding an immense tractor to the pad.
It started moving from its assembly building at Kennedy late on Tuesday evening, local time,but with a cruising speed of just over 1km/h (under 1mph), it could take 8-10 hours to complete the 6.7km (4.2 miles) journey.
